Mortise dead lock



Dec. 17, 1929.' F. E. BEST ET AL MORTISE DEAD LOCK Filed 001;. 2

Patented Dec. 17, 1929 UNITED STATES PATENT OFFICE 7 FRANK ELLISON BEST AND FREDERICK POWELL, OF SEATTLE, WASHINGTON; SAID POWELL ASSIGNOR TO FRANK E. BEST, INC., OF SEATTLE, WASHINGTON, A COR- PORATION OF WASHINGTON I MOBTISE DEAD LOCK Application filed October 2, 1924. Serial No. 741,172.

Our invention relates to improvements in mortise dead locks and the Object of our in.- vention is to provide a mortise deadlock having a latch bolt that is operable from the inside by a thumb turn, the lock being constructed so that the thumb turn may be selec tively positioned to lock the latch mechanism so that it can not be unlocked by the insertion of a key in the lock from the outside'or to leave the latch mechanism free to be operated by the insertion of a key in the look from the outside.

Other objects are to provide a mortise dead lock of simple and efficient construction-that is not-expensive to manufacture and that is comparatively easy to install on a'door.

Other and more specific objects will be ap parent from the following description taken in connection with the accompanying draw- Tn the accompanying drawings, Figure 1 is a sectional view on broken line 1-1 of Fig. 2 of a mortise dead lock constructed in accordance with our invention.

Fig. 2 is a sectional view of the same substantially on broken line 2-2 of Fig. 1, parts being shown in elevation.

Fig. 3 is a sectional view of the same substantia'lly on broken line 3-3 of Fig. 2.

Figs. 4, 5, 6 and 7 are isometric views of details of the invention.

Figs. 8 and 9 are somewhat diagrammatic detached views illustrating the operation of the locking devices.

Fig. 10 is a detached perspective view of a bushing and hub member embodied in the invention. f

Like reference numerals designate like parts throughout the several views.

Referring to the drawings 10 designates a door bored inwardly from the front edge to form a cylindrical cavity 11 for the reception or a tubular latch housing 12 and bored through from one side to theother to form a tubular passageway 13 wherein a cylindrical lock housing 14 maybe inserted, the center of the transverse passageway 13 being substantially tangent to the lowermost portion of the cavity 11.

The lower half of the latch housing 12 is the inner end of which is a cut away at the rear end to affordclearance for the lock housing 14. In assembling, the

lock housing 14 is inserted first and the latch housing 12 is afterwards inserted and is secured within the cavity 11by a face plate 16 which is made fast, by screws 17, to the edge of the door. The latch housing 12 is preferably permanently secured to the face plate16 and said face plate maybe mortised into the edge of the door when installed. The top of the lock housing 14 is cut away as at 15. 4

18 is a bolt, reciprocably supported in the face plate 16, and having arearwardlyextending shank 19, of smaller cross sectional size provided in its upper edge, near the rear end with two locking notches 20 and '21 and provided in its lower edge near the rear end with an arcuate notch 22 having inclined approaches 23 and adapted to receive bolt moving means. The rear end of thebolt shank 19 is further notched on the bottom edge as at 24 by cutting away one corner thereof to aflord clearance for certain parts hereinafter described, the forward end of notch 24 being curved downwardly as at 25 where it intersects the arcuate notch 22. The rear end of bolt shank 19 extends through the cut away portion 15 of lock housing 14.

26 is a locking member secured by a pivot 27 to an indented portion 28 on the side of latch housing 12 and having a locking lug 29 on its inner'end that is arranged to'selectively look within the notches 2O or 21' in the bolt shank 19 -tohold said bolt shank in a projected or retracted position. A spring 30 secured to lug 29 yieldingly urges such lug into engagement with the bolt shank 19. The bottomedge of the locking member 26 is relieved or cutaway on curved lines as at 26 for purposes hereinafter explained.

The lock housing 14 contains a pin tumbler lock 31 removably locked'within said housing 14 by key operated means and having a rotatablekey plug, not shown, upon throw member 32 from which'projects a pin 33.

'A tubular bushing is arranged to fit snugly within the rear end of lock housing 14' and seat against a shoulder 34 and the ing member 26 are arranged to rest, the hub Q 36 preferably being flattened slightly on the topside.

Screws 37 extending through a face plate 38 on the inner side of the door and threaded into the bushing hold the lock housing 14 in assembled position in the door.

40 is a bolt operating member arranged to fit rotatably within bushing'35'and hay-- ing on its outer end a head 41 of peculiar shape which has two spaced apart prongs 42 projecting in one direction and a lug 48 projectingintheopposite direction. vA stud in 44 extends inwardly 'from lug 43 for lifting the locking member 26 and movingthebolt 18 as hereinafter ex lained. A hole preferably square, 45 exten s lengthwise'throughbolt operating member '40 concentric withthe axis thereof. A square shank 46 is arranged to fit within square hole 45 and is secured to 'a thumb turn '47" that is rotatably mounted in face plate 38.

The inner surfaces "of theprong members 42 are cut away or rounded out as at48 to facilitate'the operation of throw pin 33.

In the operation of the lock, rotation of the lock operating member40 will first cause pin 44 tQliftJOCk-ingmeHiberQ6 so the lug "29 is "clear of notches 20 or 21and to then engage within notch 22 and move bolt "18.

Aspringcollar 50,Fi g. 4, is arranged to ht over the hub 36 on the end of bushing B5-and has inwardly bent hoolcmembers 51 arranged to snap into recesses in said hub. Thecollar is provided with two outward-1y bent lugs 52 and 53 arranged to be engaged by 'the stud pin'44 tofor-m positive stops and is further provided withresilient or yielding detents '54 and against which the pin44 may strike and over which-such'pin44 may ride, the deten'ts 54 and 55 ordinarily. serving-as stops for pin 44 but being shaped so that the-pin 44 may be caused to ride the-reo'ver by exerting excessive torqueon-thumb turn-47.

In the oeration of the lock, wlren'the bolt is project outwardly thehead41 of the lock operating member will, under ordinary oper- 'ating conditions, be stopped inthe position shown in Fig. 2 with the pin44 resting against the detent 54. From this position the lock operating member may be turned in a cloc'kwise direction to retract the bolt 18 by inserting a keyin look 31 and turning the-throw member 32 and pin 33 tothe right, the pin 33 starting from a po ition coaxial with lock operating member 40 anddescribing-arc, see dotted lines Figs. 8 and 9, about center 56 engages left hand, prongAQ' and 'turns'the lo'c'k operating member into the "positionshown in 'Fig; :8,thence continues-wits original position coaxial with lock operating member 40 to permit withdrawal of the key from the look. In a similar manner the lock operatin member may be moved from the retractetfposition,"Fig. 8, tothe locking position, Fig. 2, by turning the-key to the left.

The lock operating member may always be position any attempt to turnthrow pin will cause it to strike the walls of square opening 45 and be stopped thereby without exerting any force capable of rotatingthe lock operating member. This makes it possible for a person onthe inside tolock the door either so that it can be opened with a key by a person on the outside or so that it can not be opened at all by a person on the outside.

The foregoing descriptionand accompanying drawings clearly disclose a preferred embodiment of our invention but it will be understood that this disclosure is merely illustrative and that such changes sorted to as are within the scope ofthe 'followingclaims. V

-We claim: r

1 In a door lock ofthe class described a latch belt, "a rotatably mounted member arranged to engage with, and move said latch bolt, a thumb-turn onone side of the door, arranged to turn said. rotatably' mounted member, and a key operated lockon the other side of the door having throw means arranged to turn said latchbolt operating-member when it is set in one position but inoperative to turn said latch bolt operating member when it is set in another position.

2. In a mortise/dead lock of the class described, the combination w-ith a door 'having a hole bored inwardly from one edge and another hole bored crosswise thereof, the center of said last namedhole being substantially tangent to the peripheryof said first named hole, latch housing in said first named hole, latch mechanism'therein, a lockhousing in said last named hole and mechanismin said lock housing for operatingsaid latch bolt.;

3. In a lock of the class described a rotatable latch bolt operating member having a head provided with a substantially .U shaped radial slot extending from the center outwardly and a key operated lock having a throw pin movable inane are substantially tangent to the axis of said latch bolt ioper-ating member and projectinginto said slot said latch. bolt operating member being "arranged to be moved by said pin from certain positions but being incapable of being moved by said'pin ifrom other positions. 1

may be rebolt operating member,

} from, two spaced 4. In a lock of the class described a latch lock and bolt, a rotatable latch bolt operating member arranged to operate said latch bolt and having an axial perforation therein, a head on one end of said latch bolt operating member said head having a slot extending radially from the center outwardly, a thumb turn connected with one end of said latch bolt operating member and a lock having a throw pin movable in an are that passes through the axis of said latch bolt operating member and arranged to project into said slot.

5. In a lock of the class described a latch bolt having a notch in one edge thereof, a latch bolt operating member mounted for rotation and having means for engaging within the notch in said latch bolt for moving the same, said latch bolt operating member having a slot in one end, one end of the slot being substantially on the central axis of said latch a lock on the outer side or said door said lock having a throw pin movable in an are that passes through the axis of rotation of said bolt operating memher and that projects into said slot and a thumb turn on the inner side of said door for turning said bolt operating member.

6.. In a lock of the class described, the combination with a door having a bore that extends inwardly from one edge and having a transverse bore intersecting said first named bore the center of said transverse bore being substantially tangent to the periphery of said first named bore, a latch housing arranged to fit within said first named bore, a lock housing arranged to fit within said last named bore, a latch bolt in said latch housing, said latch bolt having a notch in its bottom edge, a latch bolt operating member embodying a rotatably mounted shank having a longitudinally extending hole of square cross section, a head on said shank, a bolt operating pin secured to said head and extending inwardly along said shank in spaced relation thereapart prongs on said head aiiording a U shaped slot diametrically opposite said pin, said slot terminating in said square hole, a bushing in said lock housing rotatably supporting said latch bolt operating member, a thumb turn for the inside of said door said thumb turn having a square shank that extends into said square hole, a key operated lock for the outside of said door said lock having a throw pin arranged project into the U shaped slot in the head of said latch bolt operating member and movable in an are that passes through the axis of said latch bolt operating member, said latch bolt operating member being arranged to be turned by said pin from two positions but being incapable of being turned by said pin from another position, detent means for permitting said latch bolt operating member to be selectively positioned by said thumb turn so that it may or may not be operated by said a latch bolt locking member arranged to be released by said latch bolt operating member.

FRANK ELLISON BEST.

FREDERICK POWELL.

llO 

